io-p9

#include <stdio.h>


int srt()
{
    int h1, h2, h3, h4, m1, m2, m3, m4, s1, s2, s3, s4, t1, t2, t3, t4, a=" ", b=" ", nr1, nr2, T1, T2, T3, T4, Td1, Td2, T, count=0;
    scanf("%d\n", &nr1);
    scanf("%d:%d:%d,%d   %d:%d:%d,%d\n", &h1, &m1, &s1, &t1, &h2, &m2, &s2, &t2); //first starting and ending time
    scanf("%s", &a);
    printf("\n");
    count++;

    scanf("%d\n", &nr2);
    scanf("%d:%d:%d,%d   %d:%d:%d,%d\n", &h3, &m3, &s3, &t3, &h4, &m4, &s4, &t4); //second starting and ending time
    scanf("%s", &b);
    printf("\n");
    count++;

    T1=t1+s1*1000+m1*60000+h1*3600000; // in milisecunde
    T2=t2+s2*1000+m2*60000+h2*3600000;
    T3=t3+s3*1000+m3*60000+h3*3600000;
    T4=t4+s4*1000+m4*60000+h4*3600000;
    Td1=T2-T1; //first displaying time
    Td2=T4-T3; //second displaying time
    T=Td1+Td2; //total displaying time
    printf("%d\n", count); //the number of subtitle groups
    printf("%02d:%02d:%02d,%03d\n", T/3600000, (T%3600000)/60000, (T%60000)/1000, (T%60000)%1000);
}

int main()
{
    srt();
    return 0;
}