from typing import Callable, Dict, List, Set, Optional
from ctypes import c_int8 as i8, c_int16 as i16, c_int32 as i32, c_int64 as i64
from ctypes import c_uint8 as u8, c_uint16 as u16, c_uint32 as u32, c_uint64 as u64
import sys


class Foo:
    def bar(self) -> str:
        return "a"


if __name__ == "__main__":
    f: Foo = Foo()
    b = f.bar()
    print(b)
