#include <cstdio>

#define forn(i, n) for (int i = 0; i < (int)(n); i++)

int main()
{
  int n = (int)1e5;
  forn(i, n)
    putchar('a');
  puts("");
  forn(i, n / 2)
    putchar('a' + (i == n / 4));
  puts("");
  return 0;
}

Submission 3766657 should get TLE.

Your test was added. Thank you.