题面
在一行中输入 2 个字符串 S1 和 S2，字符串本身不含空格的字符串 (长度均不超过 80)，2 个字符串之间以 1 个空格分隔。
将这 2 个字符串交织在一起 (laceString)，输出 laceString 后的字符串。
Note：
字符串交织指：先取第一个字符串的第 1 个字符，后取第二个字符串的第 1 个字符，再取第一个字符串的第 2 个字符，再取第二个字符串的第 2 个字符，如此重复，直至取完其中一个字符串的全部字符，最后取另一个字符串的全部剩余字符。
例子：
abc 123 ---> a1b2c3
123 abc ---> 1a2b3c
abcde 123 ---> a1b2c3de
abc 1234567 ---> a1b2c34567
输入格式
<font color="#000000"><span courier="" mso-ansi-language:="" mso-bidi-font-family:="" mso-bidi-font-weight:="" mso-bidi-language:="" mso-fareast-language:="" mso-fareast-theme-font:="" mso-hansi-font-family:="" style="font-size: 14pt; font-family: 宋体 ; mso-ascii-font-family: "> 在一行中输入 </span><span courier="" lang="EN-US" mso-ansi-language:="" mso-bidi-font-weight:="" mso-bidi-language:="" mso-fareast-font-family:="" mso-fareast-language:="" mso-fareast-theme-font:="" style="font-size: 14pt; font-family: ">2</span><span courier="" mso-ansi-language:="" mso-bidi-font-family:="" mso-bidi-font-weight:="" mso-bidi-language:="" mso-fareast-language:="" mso-fareast-theme-font:="" mso-hansi-font-family:="" style="font-size: 14pt; font-family: 宋体 ; mso-ascii-font-family: "> 个字符串，字符串本身不含空格的字符串 </span><span courier="" lang="EN-US" mso-ansi-language:="" mso-bidi-font-weight:="" mso-bidi-language:="" mso-fareast-font-family:="" mso-fareast-language:="" mso-fareast-theme-font:="" style="font-size: 14pt; font-family: ">(</span><span courier="" mso-ansi-language:="" mso-bidi-font-family:="" mso-bidi-font-weight:="" mso-bidi-language:="" mso-fareast-language:="" mso-fareast-theme-font:="" mso-hansi-font-family:="" style="font-size: 14pt; font-family: 宋体 ; mso-ascii-font-family: "> 长度均不超过 </span><span courier="" lang="EN-US" mso-ansi-language:="" mso-bidi-font-weight:="" mso-bidi-language:="" mso-fareast-font-family:="" mso-fareast-language:="" mso-fareast-theme-font:="" style="font-size: 14pt; font-family: ">80)</span><span courier="" mso-ansi-language:="" mso-bidi-font-family:="" mso-bidi-font-weight:="" mso-bidi-language:="" mso-fareast-language:="" mso-fareast-theme-font:="" mso-hansi-font-family:="" style="font-size: 14pt; font-family: 宋体 ; mso-ascii-font-family: ">，</span><span courier="" lang="EN-US" mso-ansi-language:="" mso-bidi-font-weight:="" mso-bidi-language:="" mso-fareast-font-family:="" mso-fareast-language:="" mso-fareast-theme-font:="" style="font-size: 14pt; font-family: ">2</span><span courier="" mso-ansi-language:="" mso-bidi-font-family:="" mso-bidi-font-weight:="" mso-bidi-language:="" mso-fareast-language:="" mso-fareast-theme-font:="" mso-hansi-font-family:="" style="font-size: 14pt; font-family: 宋体 ; mso-ascii-font-family: "> 个字符串之间以 </span><span courier="" lang="EN-US" mso-ansi-language:="" mso-bidi-font-weight:="" mso-bidi-language:="" mso-fareast-font-family:="" mso-fareast-language:="" mso-fareast-theme-font:="" style="font-size: 14pt; font-family: ">1</span><span courier="" mso-ansi-language:="" mso-bidi-font-family:="" mso-bidi-font-weight:="" mso-bidi-language:="" mso-fareast-language:="" mso-fareast-theme-font:="" mso-hansi-font-family:="" style="font-size: 14pt; font-family: 宋体 ; mso-ascii-font-family: "> 个空格分隔。</span></font>
输出格式
<font color="#000000"><span courier="" mso-ansi-language:="" mso-bidi-font-family:="" mso-bidi-font-weight:="" mso-bidi-language:="" mso-fareast-language:="" mso-fareast-theme-font:="" mso-hansi-font-family:="" style="font-size: 14pt; font-family: 宋体 ; mso-ascii-font-family: "> 输出 </span><span courier="" lang="EN-US" mso-ansi-language:="" mso-bidi-font-weight:="" mso-bidi-language:="" mso-fareast-font-family:="" mso-fareast-language:="" mso-fareast-theme-font:="" style="font-size: 14pt; font-family: ">laceString</span><span courier="" mso-ansi-language:="" mso-bidi-font-family:="" mso-bidi-font-weight:="" mso-bidi-language:="" mso-fareast-language:="" mso-fareast-theme-font:="" mso-hansi-font-family:="" style="font-size: 14pt; font-family: 宋体 ; mso-ascii-font-family: "> 后的字符串。</span></font>
样例
输入
abc 123
输出
a1b2c3