# your code goes here
import re
string = "A B C D"
keys = ["A", "B", "A B"]
matches = []
for k in keys:
matches += re.findall(re.escape(k), string)
print(matches)
IyB5b3VyIGNvZGUgZ29lcyBoZXJlCmltcG9ydCByZQoKc3RyaW5nID0gIkEgQiBDIEQiCmtleXMgPSBbIkEiLCAiQiIsICJBIEIiXQoKbWF0Y2hlcyA9IFtdCmZvciBrIGluIGtleXM6CiAgICBtYXRjaGVzICs9IHJlLmZpbmRhbGwocmUuZXNjYXBlKGspLCBzdHJpbmcpCiAgICAKcHJpbnQobWF0Y2hlcykK