#include <bits/stdc++.h>
char tp[100];
int main(){
	int n, i, j=1;
	for(i=1;i<=10;i++){
		sprintf(tp, "ren %d.in .%d.in", i, i);
		system(tp);
		sprintf(tp, "ren %d.out .%d.out", i, i);
		system(tp);
	}
}