#include using namespace std; #ifdef DEBUG_ #include #else #define dump(...) #endif #define FastIO cin.tie(nullptr), ios_base::sync_with_stdio(false); #define rep(i, n) for (int i = 0; (int)i < n; ++i) #define output(msg) cout << msg << '\n' #define die(msg) \ do { \ cout << msg << endl; \ exit(0); \ } while (0) template bool chmax(T& a, const T& b) { return ((a < b) ? (a = b, true) : (false)); } template bool chmin(T& a, const T& b) { return ((a > b) ? (a = b, true) : false); } using llint = long long int; int main() { FastIO; int dy[]{0, -1, 1, 0}; int dx[]{-1, 0, 0, 1}; vector cells(3); rep(i, 3) cin >> cells[i]; rep(y, 3) { rep(x, 3) { char cell = cells[y][x]; // UDLR rep(i, 4) { int ny = y + dy[i]; int nx = x + dx[i]; if (0 <= ny && ny < 3 && 0 <= nx && nx < 3) { if (cell == cells[ny][nx]) { die("No"); } } } } } output("Yes"); }