First Index Of

using System;

namespace FirstIndexOf
{
    class Program
    {
        static void Main(string[] args)
        {
            string source = Console.ReadLine();
            char target = char.Parse(Console.ReadLine());

            Console.WriteLine(FirstIndexOf(source, target));

        }

        public static int FirstIndexOf(string source, char target)
        {

            int targetFirstIndex = -1;
            // Remove the line below then add your implementation.

            for (int i = 0; i < source.Length; i++)
            {
                if (source[i] == target)
                {

                    targetFirstIndex = i;
                    break;
                }
            }

            return targetFirstIndex;
        }
    }
}