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

class textprocessor{
    private:
    static int count;
    
    public:
    static void converttoupper{
        bool v=true;
        for(inti=0;i<str.lenght();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.lenght();i++){
            str[i]=toupper(str[i]);
        }
        cout<<str<<endl;
        cout++;
    }
    else{
        cout<<"Invalid input";
    }
}};