#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <conio.h>

int main()
{
    char string[] = "dfgyugy3g4yu23g4t1fg1421d4rt21d4214yuf421ty";
    int i;
    int sum = 0;

    for (i = 0; i < strlen(string); i++)
    {
        if (isdigit(string[i]))
        {
            printf ("%c\n", string[i]);
            sum++;
        }
    }

    printf ("sum = %i", sum);
    getch();

    return 0;
}