capitalize first letter c++

#include <iostream>
#include <string>
#include <cctype>

int main() {
    std::string input;
    std::cout << "Enter a word: ";
    std::cin >> input;

    if (!input.empty()) {
        input[0] = std::toupper(input[0]);
    }

    std::cout << "Capitalized word: " << input << std::endl;

    return 0;
}