Day 2 Conditional Statements Switch.js

'use strict';

process.stdin.resume();
process.stdin.setEncoding('utf-8');

let inputString = '';
let currentLine = 0;

process.stdin.on('data', inputStdin => {
    inputString += inputStdin;
});

process.stdin.on('end', _ => {
    inputString = inputString.trim().split('\n').map(string => {
        return string.trim();
    });
    
    main();    
});

function readLine() {
    return inputString[currentLine++];
}

function getLetter(s) {

    // Write your code here
    switch(s.charAt(0))
    {
        case('a' || 'e' || 'i' || 'o' || 'u'):
             return 'A';
             
        case('b' || 'c' || 'd' || 'f' || 'g'):
            return 'B';
            
        case('h' || 'j' || 'k' || 'l' || 'm'):
             return 'C';
             
        case('z'|| 'n' || 'p' || 'q' || 'r' || 's' || 't' || 'v' || 'w' ||'x' || 'y' ):
            return 'D';
              
    }
    
}


function main() {
    const s = readLine();
    
    console.log(getLetter(s));
}