View Compilation Error

0_0_3162350_11101.cpp: In function `int main()':
0_0_3162350_11101.cpp:5: error: conflicting declaration 'long long int a'
0_0_3162350_11101.cpp:4: error: 'a' has a previous declaration as `int a'
0_0_3162350_11101.cpp:5: error: declaration of `long long int a'
0_0_3162350_11101.cpp:4: error: conflicts with previous declaration `int a'