View Compilation Error

0_0_25926108_17996.cpp: In function 'int main()':
0_0_25926108_17996.cpp:6:2: error: 'll' was not declared in this scope
  ll a,b;
  ^
0_0_25926108_17996.cpp:7:27: error: 'a' was not declared in this scope
  while(~scanf("%lld%lld",&a,&b))
                           ^
0_0_25926108_17996.cpp:7:30: error: 'b' was not declared in this scope
  while(~scanf("%lld%lld",&a,&b))
                              ^