#include <iostream>

 #include <algorithm>

 #include <cstring>

 #include <cstdio>

 #include <cmath>

 #include <stack>

 #include <set>

 #include <map>

 #include <queue>

 #include <climits>

 #include <bitset>

 #define PI 3.1415926

 using namespace std;

 const int MY_MAX = ;

 int N, M;

 int main()

 {

     cin >>N;

     while (N --)

     {

         string my_str;

         cin >>my_str;

         int str_len = my_str.size();

         for (int i = ; i < str_len; ++ i)

         {

             if (my_str[i] >= 'A' && my_str[i] <= 'Z')

                 my_str[i] = char('a' + my_str[i] - 'A');

             else

                 my_str[i] = char('A' + my_str[i] - 'a');

         }

         cout <<my_str <<endl;

     }

     return ;

 }