line = input().upper()

final_string = ""

current_string_to_repeat = ""

unique_symbols = 0

# there are 2 stages of processing each string-number sequence
# to keep the current stage in stageOfProcessing:
# 1- collecting symbols for current_string.
# 2- collecting digits for number
stageOfProcessing = 1

current_number_to_repeat = ''       # number can contain multiple digits

for ch in line:
    if ch.isdigit() and stageOfProcessing == 1:         # current char is digit, and it is the first one of the number
        current_number_to_repeat += ch
        stageOfProcessing = 2

    elif ch.isdigit() and stageOfProcessing == 2:       # current char is digit, but not the first one of the number
        current_number_to_repeat += ch

    elif stageOfProcessing == 1:                        # current char is not a digit, so we collect symbols
        current_string_to_repeat += ch

    elif stageOfProcessing == 2:                        # end of the current string-number sequence
        final_string += current_string_to_repeat * int(current_number_to_repeat)
        current_string_to_repeat = ch
        current_number_to_repeat = ''
        stageOfProcessing = 1

final_string += current_string_to_repeat * int(current_number_to_repeat)        # to add the last string-number sequence
unique_symbols = len(set(final_string))                                         # take unique symbols count from result
print(f"Unique symbols used: {unique_symbols} \n{final_string}")