#include <stdio.h>

int main() 
{
	FILE *input;
	input = fopen("./input", "r");

	char inChar;
	char numbers[4];
	numbers[2] = '\n';
	numbers[3] = '\0';
	int numIndex = 0;
	int sum = 0;

	while((inChar = fgetc(input)) != EOF) {
		if (inChar >= '0' && inChar <= '9' && numIndex == 0) {
			numbers[0] = inChar;
			numbers[1] = inChar;
			numIndex = 1;
		} else if (inChar >= '0' && inChar <= '9' && numIndex == 1) {
			numbers[1] = inChar;
		} else if (inChar == EOF || inChar == '\n' || inChar == '\0') {
			sum += (numbers[0] - '0') * 10 + (numbers[1] - '0');
			numIndex = 0;
			numbers[0] = '0';
			numbers[1] = '0';
		}
	}

	fclose(input);
	printf("%d\n", sum);
}