#!/bin/bash

read -p "please enter a phrase: " text

if [[ -z "$text" ]]; then
    echo "please enter a string"
    exit
fi

count=0

for ((i=0; i<${#text}; i++)); do
    char="${text:i:1}"
    if [[ "$char" =~ [A-Za-z]]]; then
        count++
    fi
done

echo "Your string contain $count letter"