input: 
  def foo(a: int, b: int) -> int:
      """Convert the following Java method to Python:
      public class Foo {
        public int foo( int a, int b ) {
          return a + b;
        }
      }
      >>> foo(1, 2)
      3
      >>> foo(0, 0)
      0
      """
      return a + b
  
output:     
      return a + b
  