View Compilation Error

0_0_19757311_16907.cpp: In function 'int main()':
0_0_19757311_16907.cpp:2:12: error: expected unqualified-id before 'long'
 #define ll long long
            ^
0_0_19757311_16907.cpp:4:9: note: in expansion of macro 'll'
    ll a,ll b;
         ^
0_0_19757311_16907.cpp:5:25: error: 'b' was not declared in this scope
    scanf("%lld%lld",&a,&b);
                         ^