PROGRAMMING:Find the largest of the three strings

Use 3 × The two-dimensional character array of 20 stores three strings, finds out the largest string and outputs it.
###Input format:
Input 3 strings in 3 lines respectively. Do not use newline, space or tab in the string
###Output format:
Output in the order of "the largest string is: the largest string" in two lines.
###Input example:
```in
as
qwer
zxc
```
###Output example:
```out
The largest string is:
zxc
```






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