View Compilation Error

0_0_39781887_20727.cpp: In function 'int main()':
0_0_39781887_20727.cpp:14:25: error: 'strlen' was not declared in this scope
   14 |                 a_len = strlen(a);
      |                         ^~~~~~
0_0_39781887_20727.cpp:2:1: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    1 | #include<iostream>
  +++ |+#include <cstring>
    2 | #include<string>