from typing import List


def evalRPN(tokens: List[str], verbose=False) -> int:
    """Evaluate an integer expression in Reversed Polish Notation (aka Postfix Notation)

    Keyword arguments:
    tokens -- list of tokens presented as strings, can be integers or operators '+,-,*,/'
    verbose -- flag to enable stack reporting during the evaluation (default False)
    """
    operators = {"+": int.__add__,
                 "*": int.__mul__,
                 "/": int.__truediv__,
                 "-": int.__sub__}
    stack: List[int] = []
    for t in tokens:
        if t in operators:
            r, l = stack.pop(), stack.pop()
            stack.append(int(operators[t](l, r)))
            print(stack)
        else:
            stack.append(int(t))
            print(stack)
    return stack[0]