#include <bits/stdc++.h>
#include "grader.h"
#include "memory.h"
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define pb push_back
#define FIO ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
using namespace std;
typedef long long ll;
typedef pair <ll, ll> pii;
/*
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 play() {
vector <int> v[25];
for (int i = 0; i < 50; i++) v[faceup(i+1)-'A'].pb(i);
for (int i = 0; i < 25; i++) for (int j = 0; j < 2; j++) faceup(v[i][j]+1);
}
//----------
/*
void playgame(){
int i;
for (i=1;i<=50;i++) {
card[i] = getchar();
}
moves = candies = 0;
play();
if (candies != 25) {
exit(91);
}
}
int main(){
playgame();
printf("OK %d\n",moves);
return 0;
}*/
