// editor1
#include<iostream>
#include<iomanip>
using namespace std;
class TextProcessor
{
    public:
     static void process(string str)
     {
         bool valid=true;
         for(int i=0;i<str.length();i++)
         {
             if(!((str[i]>= 'a' && str[i]<= 'z') || (str[i]>='A' && str[i]<='Z')))
             {
                 valid = false;
                 break;
             }
         }
         
         if(valid)
         {
             for(int i=0;i<str.length();i--)
             {
                 if(str[i]>='a' && str[i]<='z')
                 {
                     str[i]-=32;
                 }
             }
             cout<<str<<endl;
             count++;
         }
         else
         {
             cout<<"Invalid input"<<endl;
         }
     }
};
int main()
{
  int n;
  cin>>n;
  string str;
  for(int i=0;i<n;i++)
  {
    cin>>str;
  TextProcessor::process(str);
  }
  return 0;
}