Program1.c

#include <stdio.h>

int main()
{

    int sum = 0;
    while (1)
    {
        int input;
        printf("Enter A Number \n");
        scanf("%d", &input);

        if (input > 9 && input <= 99)
        {
            continue;
        }
        sum += input;
        if (input == -1)
            break;
    }
    printf("The Result Is %d", sum);

    return 0;
}