PROGRAMMING:String partial join
Write a program to realize the partial connection of two strings, and connect the string starting from the subscript m in the first string with the string starting from the subscript n in the second string and output it.
###Input format:
Enter the first string (no more than 80 characters) in the first line, the second string (no more than 80 characters) in the second line, and two integers m and N in the third line, separated by a space.
###Output format:
Output the connected string and wrap it.
If the value of M and N exceeds the effective length of the string, please prompt to re-enter. For details, please refer to example 2.
###Input sample 1:
```in
abcdefg
hijklmnopqrst
1 2
```
###Output sample 1:
```out
bcdefgjklmnopqrst
```
###Input sample 2:
```in
abcdefg
hijklmnopqrstuvwxyz
7 7
6 7
```
###Output sample 2:
```out
Input m again(m<7):
Input n again(n<19):
gopqrstuvwxyz
```
answer：If there is no answer, please comment
###Input format:
Enter the first string (no more than 80 characters) in the first line, the second string (no more than 80 characters) in the second line, and two integers m and N in the third line, separated by a space.
###Output format:
Output the connected string and wrap it.
If the value of M and N exceeds the effective length of the string, please prompt to re-enter. For details, please refer to example 2.
###Input sample 1:
```in
abcdefg
hijklmnopqrst
1 2
```
###Output sample 1:
```out
bcdefgjklmnopqrst
```
###Input sample 2:
```in
abcdefg
hijklmnopqrstuvwxyz
7 7
6 7
```
###Output sample 2:
```out
Input m again(m<7):
Input n again(n<19):
gopqrstuvwxyz
```
answer：If there is no answer, please comment