atcoder/abc144A

Author: xirc

atcoder/abc144/A/main.cpp

@@ -0,0 +1,21 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+using ll = int64_t;
+using ff = long double;
+
+int main() {
+    ios_base::sync_with_stdio(false);
+    cin.tie(0); cout.tie(0);
+
+    int A, B;
+    cin >> A >> B;
+
+    if (A >= 10 || B >= 10) {
+        cout << -1 << endl;
+    } else {
+        cout << (A * B) << endl;
+    }
+
+    return 0;
+}