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First thing I though of. It can probably be golfed more.
Input comes from sdtin. Output goes to stdout as a set object
print set(raw_input())&set(""raw_pint raw_pintsese(u)&\""\&\"")
print set(raw_input())&set(" raw_pintse(u)&\"")
print set(raw_input())&set("raw_pint se(u)\&\"")
