How to check if string is made up of only certain letters

[katyalrikin]

sent = raw_input()
if sent.__contains__("S" or "I" or "H" or "X" or "O" or "N" or "Z"):
    print("YES")
else:
    print("NO")

This is what I have. If each letter in sent is in that list, print YES else print NO. But as long as i have 1 from the list it prints YES. That is not what I want. How can i fix this?

[bvdet]

You will need a loop to do that using the in keyword.

>>> if False in [c in sent for c in letterList]:
...     print "No"
... else:
...     print "Yes"
...     
No
>>>

[dwblas]

You can also use set difference and test for length

control_set=set(["S", "I", "H", "X", "O", "N", "Z"])
test_set = set(["B", "S", "I", "H", "X", "O", "N", "Z", "A", "C"])
result_set=test_set.difference(control_set)
print result_set, len(result_set), "= False"
 
test_set = set(["S", "I", "H", "X", "O", "O"])
result_set=test_set.difference(control_set)
print result_set, len(result_set), "= True"