View Compilation Error

0_0_39005464_10920.cpp: In function 'int main()':
0_0_39005464_10920.cpp:6:1: error: 'in' was not declared in this scope; did you mean 'int'?
    6 | in b;
      | ^~
      | int
0_0_39005464_10920.cpp:7:9: error: 'b' was not declared in this scope
    7 | cin>>a>>b;
      |         ^