PROGRAMMING:String connection
Enter two strings from the keyboard, connect the second string at the end of the first string, and then output the connected string. The strcat function cannot be used.
###Input format:
Input only one line, for two strings, separated by spaces. Each string is no longer than 100.
###Output format:
The output has only one line, which is the connected string.
###Input example:
```in
hello world
```
###Output example:
```out
helloworld
```
answer：If there is no answer, please comment
###Input format:
Input only one line, for two strings, separated by spaces. Each string is no longer than 100.
###Output format:
The output has only one line, which is the connected string.
###Input example:
```in
hello world
```
###Output example:
```out
helloworld
```
answer：If there is no answer, please comment