iostream.py

class iostream:
    def __init__(self):
        self.s = []
        self.i = 0

    def next(self, T=str):
        if(self.i < len(self.s)):
            ret = self.s[self.i]
            self.i += 1
            return T(ret)
        st = input()
        while(st == ""):
            st = input()
        self.s = st.split(" ")
        self.i = 0
        return T(self.next(T))