답안

#답1
user_input = input()
s = ''
storeString = user_input[0]
count = 0
for i in user_input:
    if i == storeString:
        count += 1
    else:
        s += str(count) + storeString
        storeString = i
        count = 1
s += str(count) + storeString
print(s)

#답2 - 이해를 돕기 위한 예제

import re

input_data = 'aaabbccccccasss'
rule = re.compile('[a-c]+')

one = re.findall('b', input_data)
two = re.findall(rule, input_data)
three = re.findall('(\\w)(\\1*)', input_data)

print(one)
print(two)
print(three)

#답2 - 풀이

import re

input_data = 'aaabbccccccasss'
rule = re.compile('[a-c]+')

one = re.findall('b', input_data)
two = re.findall(rule, input_data)
three = re.findall('(\\w)(\\1*)', input_data)

print(one)
print(two)
print(three)

s = ''
for i, j in three:
    s += str(len(j)+1)+i
print(s)