using System;

Console.WriteLine("Please enter amount of numbers :");

int n = int.Parse(Console.ReadLine());

int[] numbers = new int[n];

Console.WriteLine("enter " + n + " numbers :");

for (int i = 0; i < n; i++)

{

    int input = int.Parse(Console.ReadLine());  

    numbers[i] = input;

}

int index = 0;

bool flag = true;

int num = 0;    

while (index < n && flag)

{

    num = numbers[index];

    if (num % 7 == 0 && num != 0)

    {

        flag = false;

    }

    else

    {

        while (num > 0)

        {

            if (num % 10 == 7)

            {

                flag = false;

            }

            num /= 10;

        }

        if (flag)

        {

            index++;

        }

    }

}

if(index == n)

{

    Console.WriteLine("not found.");

}

else

{

    Console.WriteLine(index + " " + numbers[index]);

}