#include<bits/stdc++.h>
using namespace std;
#define ll long long
const int N=5e5+5;
int read(){
	char ch=getchar();int k=0,f=1;
	if(!isdigit(ch)){
		if(ch=='-')f=-1;
		ch=getchar();
	}
	while(isdigit(ch)){
		k=k*10+(ch-'0');
		ch=getchar();
	}
	return k*f;
}

int main(){
	
	return 0;
}
