def pal(s):
    n = len(s)
    result = True
    for i in range(n//2):
        if s[i] != s[-i-1]:
            result = False
    return(result)

def rhy(s, key):
    n = len(s)
    m = len(key)
    if s[n-m:] == key:
        return(True)
    else:
        return(False)

mf = open("/Users/koc/Desktop/abc/words.txt", "r")
mw = open("/Users/koc/Desktop/abc/out1.txt", "w")

arr = []
for s in mf:
    t = s[0:len(s)-1]
    arr.append(t)

parr = []
for s in arr:
    if pal(s):
        parr.append(s)

rarr = []
for s in arr:
    if rhy(s, "ist"):
        rarr.append(s)

for s in rarr:
    mw.write(s+"\n")
mw.close()