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#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <algorithm>
#include <string>
#include <cstring>
#include <cmath>
#include <map>
#include <stack>
#include <set>
#include <vector>
#include <queue>
#include <time.h>
#define eps 1e-7
#define INF 0x3f3f3f3f
#define MOD 1000000007
#define rep0(j,n) for(int j=0;j<n;++j)
#define rep1(j,n) for(int j=1;j<=n;++j)
#define pb push_back
#define mp make_pair
#define set0(n) memset(n,0,sizeof(n))
#define ll long long
#define ull unsigned long long
#define iter(i,v) for(edge *i=head[v];i;i=i->nxt)
#define max(a,b) (a>b?a:b)
#define min(a,b) (a<b?a:b)
#define print_runtime printf("Running time:%.3lfs\n",double(clock())/1000.0)
#define TO(j) printf(#j": %d\n",j);
//#define OJ
using namespace std;
const int MAXINT = 100010;
const int MAXNODE = 100010;
const int MAXEDGE = 2*MAXNODE;
char BUF,*buf;
int read(){
char c=getchar();int f=1,x=0;
while(!isdigit(c)){if(c=='-') f=-1;c=getchar();}
while(isdigit(c)){x=x*10+c-'0';c=getchar();}
return f*x;
}
char get_ch(){
char c=getchar();
while(!isalpha(c)) c=getchar();
return c;
}
//------------------- Head Files ----------------------//
void get_input();
void work();
int main() {
#ifndef OJ
freopen("tst.in","r",stdin);
freopen("tst.out","w",stdout);
#endif // OJ
get_input();
work();
return 0;
}
void work(){
}
void get_input(){
}