input didn't taken by compiler in c++

I get an issue in getting a input from the user.
example -
int main()
{
int a;
cout<"enter a number :"<>a;
return 0;
}
output 👎
enter a number :
//but here what the problem is compiler didn't allow to input a number.

for your reference my extension are:
1. code runner
2. c/c++
3. g++

please solve this issue asap.