
OX={'A':10, 'B':11, 'C':12, 'D':13, 'E':14, 'F':15}

duizhao=['0000', '0001', '0010', '0011', '0100', '0101', '0110', '0111', '1000']

def change(stra):








num=[]

n=int(input("plase n:"))
for i in range(n):
    nu = input("plase input a oxnum:")
    num.append(nu)

