lst = [1, 3, 4, 7]
dic = {"odin": 1, "dva": 2, "tri": 3, "chetire": 4, "pyat": 5}
result = [k for k, v in dic.items() if v in lst]
diff = set(lst) - {dic[v] for v in result}
print(diff)
bHN0ID0gWzEsIDMsIDQsIDddCgpkaWMgPSB7Im9kaW4iOiAxLCAiZHZhIjogMiwgInRyaSI6IDMsICJjaGV0aXJlIjogNCwgInB5YXQiOiA1fQoKcmVzdWx0ID0gW2sgZm9yIGssIHYgaW4gZGljLml0ZW1zKCkgaWYgdiBpbiBsc3RdCmRpZmYgPSBzZXQobHN0KSAtIHtkaWNbdl0gZm9yIHYgaW4gcmVzdWx0fQpwcmludChkaWZmKQo=