#include<iostream>
using namespace std;

class Textprocessor
{
    public:
    static void proccess(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]=str[i]-32;
               }
            }
            cout<<str<<endl;
        }
        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;
}