#include<iostream>
using namespace std;
class TextProcessor {
    public:
    static int count;
    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]=str[i]-32
                }   
                
            }
            cout<<str<<endl;
             count++;
        }
        else{
            cout<<"Invalid input"<<endl;
        }
    
    }
};
int TextProcessor::count =0;
int main(){
    int n;
    cin>>n;
    string str;
    for(int i=0; i<0; i++){
        cin>>str;
        TextProcessor::process(str);
    }
    return 0;
}