python多组读入

import sys
try:
    while True:
        alpha=["A","H","I","M","O","T","T","U","V","W","X","Y"]
        s = sys.stdin.readline().strip()
        if s == '':
            break
        T = ""
        flag = True
        for i in range(len(s) - 1, -1, -1):
            T += s[i]
            if (s[i] not in alpha):
                flag = False
                break
        if (T == s and flag):
            print("YES")
        else:
            print("NO")
except:
    pass