#include "grader.h"
#include "memory.h"
#include <bits/stdc++.h>
using namespace std;/*
void play();
static char card[51];
static int up[2], is_up[51], candy[25], candies, moves;
char faceup(int C){
int c0, c1;
if (C < 1 || C > 50 || is_up[C]) {
exit(92);
}
is_up[C] = 1;
up[moves%2] = C;
moves++;
if (moves%2 == 0) {
c0 = card[ up[0] ] - 'A';
c1 = card[ up[1] ] - 'A';
if (c0==c1 && !candy[c0]) {
candy[c0] = 1;
++candies;
}
is_up[ up[0] ] = is_up[ up[1] ] = 0;
}
return card[C];
}
void playgame(){
int i;
for (i=1;i<=50;i++)
{
cin>>card[i];
}
moves = candies = 0;
play();
if (candies != 25) {
exit(91);
}
}
int main(){
playgame();
cout<<"OK "<<moves<<"\n";
return 0;
}*/
void play()
{
vector <int> a, b;
a.assign(25, -1);
b.assign(25, -1);
char c, d;
cin>>c;
int e, f;
for(int i=1; i<=25; ++i)
{
c=faceup(2*i-1);
if(a[c-'A']==-1)
{
a[c-'A']=2*i-1;
}
else
{
b[c-'A']=2*i-1;
}
d=faceup(2*i);
if(a[d-'A']==-1)
{
a[d-'A']=2*i;
}
else
{
b[d-'A']=2*i;
}
e=c-'A';
f=d-'A';
}
for(int i=0; i<25; ++i)
{
if(i!=e && i!=f)
{
faceup(a[i]);
faceup(b[i]);
}
}
faceup(a[e]);
faceup(b[e]);
faceup(a[f]);
faceup(b[f]);
return;
}
