def getSmallestString(word,substr):
    for i in range(len(word)):
        if word[i] == "?":
            start = i
            end = start
            while word[end] == "?":
                end += 1

            # print(word[end])
            if word[end] in substr:
                if substr.index(word[end]) == abs(start-end):
                    # word[start:end] = substr[:substr.index(word[end])]
                    word = word.replace(word[start:end],substr[:substr.index(word[end])],1)
                    print(word)
                else:
                    if len(substr[substr.index(word[end]):]) >= abs(start-end):
                        word = word.replace(word[start:end],substr[substr.index(word[end]):substr.index(word[end])+abs(start-end)],1)

            else:
                return -1

    return word