#include<iostream>
#include<string>
#include<cctype>
using namespace std;

class textprocessor{
    private:
    static int strcount;
    
    public:
    static void converttoupper(string &str)
    {
        bool valid = true;
        
    for(int i=0;i<str.length;i++){
            for(!(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++){
            str[i]=toupper(str[i]);
        }
        cout<<str<<endl;
        cout++;
    }
    else{
        cout<<"Invalid input"<<endl;
    }
};
int textprocessor::cout = 0;

int main(){
    int n;
    if(!(cin>>n))
    return 0;
    cin.ignore();
    
    string str;
    
    for(int i = 0;i<n;i++){
        cin>>str;
        textprocessor::converttoupper(str);
        return 0;
        
    }
}