import sys, math
sys.set_int_max_str_digits(0)

S = input()
from itertools import groupby
def runLengthEncode(S): # list でも str でも OK
    grouped = groupby(S)
    res = []
    for k, v in grouped:
        res.append((k, int(len(list(v)))))
    return res

ans = []
for k, v in runLengthEncode(S):
    ans.append(k)
print(''.join(ans))