diff --git a/main.cpp b/main.cpp
index 4d41b1f..9c9c2f8 100644
--- a/main.cpp
+++ b/main.cpp
@@ -32,6 +32,14 @@ int main(int argc, char* argv[]) {
 			cin >> sequence[n];
 	}
 
+	// Clearing
+	if(N < 1) return 1;
+	if(M < 1) return 1;
+	if(player != HUMAN && player != BOT) return 1;
+	if(gen != HUMAN && gen != RANDOM) return 1;
+	for(auto col : sequence)
+		if(col < 0 || col >= M) return 1;
+
 	// Human info
 	if(player == HUMAN) {
 		cout << std::endl;