#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main() {
	char c, *ptr, str[256], n[16];
	int i = 0, j = 0, len;
	long sum = 0;
 
	while ((c = getchar()) != EOF) {
		str[i] = c;
		i++;
	}
	str[i] = '\0';
	len = strlen(str);
	for (i = 0; i <= len; i++) {
		n[j] = str[i];
		j++;
		if ((str[i] == 32) || (str[i] == '\n')) {
			n[j] = '\0';
			if ((n[0] == '\0') || (n[0] < 48) || (n[0] > 57)) {
				char n[2] = {'0', '\0'};
			}
			sum = sum + strtol(n, &ptr, 10);
			j = 0;
		}
	}
	printf("\n%ld\n", sum);
}

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

MTAwICsgMjMgPSAxMjMKJDEwMCAtIDIzID0gNzcu

100 + 23 = 123
$100 - 23 = 77.