9.Najdi go zbirot

#include <stdio.h>
int main () {
    char c;
    int sum = 0;
    int lastDigit = 0;
    while (scanf("%c", &c)) {
    if (c == '!') {
    break;
    }
    int digit = 0;
    if (c>='0' && c<='9') {
    digit = c - '0';
    if (lastDigit) {
    lastDigit *= 10;
    lastDigit += digit;
    sum+= lastDigit;
    lastDigit = 0;
    } else {
    lastDigit = digit;
    }
    } else if (lastDigit) {
    sum += lastDigit;
    lastDigit = 0;
    } else {
    lastDigit = 0;
    }
    }
    if (lastDigit) {
    sum += lastDigit;
    }
    printf("%d\n", sum);
    return 0;
}