//Stand up for the faith！

 #include<bits/stdc++.h>

 #define INF 0x3f3f3f3f

 #define LL long long

 #define FRO freopen

 #define FCO fclose

 #define US unsigned

 #define CN const

 #define MAXN 20001

 using namespace std;

 inline int read()

 {

     int s=,w=;

     char ch=getchar();

     while(ch<''||ch>'')

     {

         if(ch=='-')w=-;

         ch=getchar();

     }

     while(ch>=''&&ch<='')

     {

         s=s*+ch-'';

         ch=getchar();

         }

     return s*w;

 }

 int main(void)

 {

 //  FRO("****.in","r",stdin);

 //  FRO("****.out","w",stdout);

     return ;

     FCO(stdin);FCO(stdout);

 }