Вычислить количество букв в слове или предложении.

count_letters.js

function count_letters(word) {
    var count = 0;
    for (var i = 0; i < word.length; i++) {
        count += 1;
    }
    return count;
}

count_letters.py

def count_letters(word):
    count = 0
    for i in word:
        count += 1
    return count

count_letters.swift

func count_letter(word: String)-> Int {
    var count = 0
    for i in word{
        count += 1
    }
    return count
}