View Compilation Error

0_0_16956716_28232.cpp: In function 'data mul(data, data)':
0_0_16956716_28232.cpp:33:55: error: 'B' was not declared in this scope
     return data ((a.x * b.x % mod + a.y * b.y % mod * B % mod) % mod, (a.x * b.y + a.y * b.x) % mod);
                                                       ^
0_0_16956716_28232.cpp: In function 'int main()':
0_0_16956716_28232.cpp:66:16: error: 'A' was not declared in this scope
         cin >> A >> B >> x >> n;
                ^
0_0_16956716_28232.cpp:66:21: error: 'B' was not declared in this scope
         cin >> A >> B >> x >> n;
                     ^