View Compilation Error

0_0_26023788_17261.cpp:15:7: error: 'll' does not name a type
 const ll mod=998244353;
       ^
0_0_26023788_17261.cpp: In function 'int main()':
0_0_26023788_17261.cpp:32:22: error: 'c2' was not declared in this scope
         cin>>a2>>b2>>c2;
                      ^