#include <stdio.h>
#include <cs50.h>
#include <string.h>

// The amount of input lines
const int lines = 1000;

int extract_number(char *text);

int main(void) {
    int sum = 0;

    for (int i = 0; i < lines; i++) {
        sum += extract_number(get_string(""));
    }

    printf("%i\n", sum);
    return 0;
}

/* Get the right number from both sides of the string
*/
int extract_number(char *text) {
    int length = strlen(text);
    int first;

    for (int i = 0; i < length; i++) {
        char c = text[i];

        if (c >= '0' && c <= '9') {
            first = c - '0';
            break;
        }
    }

    for (int i = 1; i <= length; i++) {
        char c = text[length - i];

        if (c >= '0' && c <= '9') {
            return (first * 10) + (c - '0');
        }
    }
}