#include <cstdio>
#include <iostream>
#include <cstdlib>

int main()
{
    char cmd[100];
    sprintf(cmd, "ren 2017-yo-t1-in_s1.txt .1.in");
    system(cmd);
    sprintf(cmd, "ren 2017-yo-t1-in_s2.txt .2.in");
    system(cmd);
    sprintf(cmd, "ren 2017-yo-t1-out_s1.txt .1.out");
    system(cmd);
    sprintf(cmd, "ren 2017-yo-t1-out_s2.txt .2.out");
    system(cmd);
    for(int i = 1 ; i < 6 ; i++ )
    {
        sprintf(cmd, "ren 2017-yo-t1-in%d.txt .%d.in", i, i+2);
        system(cmd);
        sprintf(cmd, "ren 2017-yo-t1-out%d.txt .%d.out", i, i+2);
        system(cmd);
    }
}