#!/usr/bin/env python
# -*- coding: utf-8 -*-

def fukusuu_replace(lines):
    wawawa_dict = {
        'せい': 'SAY',
        'へい': 'HEY',
        'わい': 'WAI',
    }

    for key, value in wawawa_dict.items():
        lines = lines.replace(key, value)

    return lines


result = fukusuu_replace('せかいへいわいわい')
print(result)