from itertools import groupby

def runLengthEncode(S: str) -> list[tuple]:
    grouped = groupby(S)
    res = []
    for k, v in grouped:
        res.append((k, int(len(list(v)))))
    return res

def Main():
    s=input()
    t=runLengthEncode(s)
    for x in t:
        print(x[0],end="")
    print()

    


Main()