//Simple loop
#include <iostream>
#include <string>
#include <ctype.h>
 
using namespace std;
 
string UserInput(string);
 
int main(void)
{
 
	string input;
 
    // Enter user input
	cout << "Enter your input: ";
	cin >> input;
 
	// Display user input
    cout << "You entered: " << UserInput(input) << endl;
    return 0;
 
}
 
  // Example function to uppercase the string. 
    string UserInput(string input) {
    	for (int i = 0; i < input.length(); ++i) {
             input[i] = toupper(input[i]);
        }
    	return input;
    }

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bWFrZSB0aGlzIHVwZXJjYXNl

make this upercase