#include<iostream>
#include<string>
#include<cctype>
using namespace std;
class textprocessor{
    public:
    static int count;
    static void process(string str){
        for(int i=0;i<str.length();i++){
            if((str[i]>='a' && str[i]<='z')||
               (str[i]>='A' && str[i]<='Z')){
                   continue;
               }else{
                   cout<<"Invalid input"<<endl;
                   return;}
               }
        }
        for(int i=0;i<str.length();i++){
            str[i]=toupper(str[i]);
        }
        cout<<str<<endl;
        count++;
    }
};
int TextProcessor::count=0;
int main(){
    int n;
    cin>> n;
    for(int i=0;i<n;i++){
        string str;
        cin>>str;
        TextProcessor::processor(str);
    }
    return 0;
}