Vowel or Consonant

The code has been modified slightly and now uploaded to the site.

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410.cpp

#include <iostream>
using namespace std;

int main(){
    char letter;

    std::cout << "Enter a letter: \n";
    std::cin >> letter;

    if (letter == 'A' || letter == 'a' || letter == 'E' || letter == 'e' || letter == 'I' || letter == 'i' || letter == 'O' || letter == 'o' || letter == 'U' || letter == 'u'){
        std::cout << letter << " is a vowel\n";
    }
    else if ((letter < 'A' || letter > 'Z') && (letter < 'a' || letter > 'z')){
        std::cout << letter << " is an invalid input\n";
    }
    else {
        std::cout << letter << " is a consonant\n";
    }
}

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