#!/usr/bin/env python3

import sys

def correct_paren(expr: str) -> bool:
    stack = []
    for char in expr:
        if char in '([{':
            stack.append(char)
        elif char == ')':
            if len(stack) == 0 or stack.pop() != '(':
                return False
        elif char == ']':
            if len(stack) == 0 or stack.pop() != '[':
                return False
        elif char == '}':
            if len(stack) == 0 or stack.pop() != '{':
                return False

    return len(stack) == 0

def main() -> int:
    if correct_paren(input()):
        print("ano")
        return 0
    else:
        print("nie")
        return 0

if __name__ == '__main__':
    sys.exit(main())