#include <cstdio>
#include <stdlib.h>
int main()
{
    int n;
    char fn[100];
    scanf("%d%s", &n, fn);
    char cmd[100];
    freopen(".info","w",stdout);
    printf("%d\n1000",n);
    for(int i = 1 ; i <= n ; i++ )
    {
        sprintf(cmd, "ren %s.%d.in .%d.in", fn, i,  i);
        system(cmd);
        sprintf(cmd, "ren %s.%d.out .%d.out", fn, i, i);
        system(cmd);
    }
}