#define <stdio.h>
int main ()
{
    char mystrings[8][5] = { {"ABC"},{"DEF"},{"GHI"},{"JKL"},{"MNO"},
                             {"PQRS"},{"TUV"},{"WXYZ"} };
    int i,j,k;
    int num;

    printf("Enter a number (3-digit): ");
    scanf("%d", &num);
    printf("\n");

    if (num%10 == 0 || num%10 == 1)
       printf("Invalid input! The number should not contain 0 or 1.\n\n");
    else if ((num/10)%10