#include<bits/stdc++.h>
using namespace std;
typedef long long ll;

inline int read(){
    int x = 0,f = 1;
    char ch = getchar();
    while(ch < '0' || ch > '9'){
        if(ch == '-')
            f = -1;
        ch = getchar();
    }
    while(ch >= '0' && ch <= '9'){
        x = (x << 1) + (x << 3) + (ch ^ 48);
        ch = getchar();
    }
    return x * f;
}

inline void write(int x)
{
    char F[200];
    int tmp = x > 0 ? x : -x;
    if(x<0) putchar('-');
    int cnt = 0;
	while(tmp > 0){
        F[cnt++] = tmp%10+'0';
        tmp /= 10;
    }
    while(cnt > 0) putchar(F[--cnt]);
    putchar('\n');
}

int main(){
	return 0;
}

打CF了，晚点回，谢谢啦。