#define _XOPEN_SOURCE

#include <stdlib.h>
#include <sys/stat.h>
#include <stdio.h>
#include <dirent.h>
#include <time.h>
#include <string.h>

int main(int argc, char *argv []) {
    const int BUFF_SIZE = 18;
    char first_datetime[BUFF_SIZE];
    char second_datetime[BUFF_SIZE];
    fgets(first_datetime, BUFF_SIZE, stdin);
    struct tm first;
    memset(&first, 0, sizeof(first));
    strptime(first_datetime, "%Y-%m-%d %H:%M", &first);
    first.tm_isdst = -1;
    while(fgets(second_datetime, BUFF_SIZE, stdin) != NULL) {
        time_t first_time = mktime(&first);
        struct tm second;
        memset(&second, 0, sizeof(second));
        strptime(second_datetime, "%Y-%m-%d %H:%M", &second);
        second.tm_isdst = -1;
        time_t second_time = mktime(&second);
        double diff = difftime(second_time, first_time) / 60;
        printf("%ld\n", (long)diff);
        first = second;
    }
}