string = input()
out = "" 
j = string[0]
time = 1 # 出现次数
k = 1 # 遍历次数
for i in string[1:]:
    if i == j:
        time += 1
        if k == len(string) - 1:
            out += "{}{}".format(time,j)
    else:
        out += "{}{}".format(time,j)
        time = 1
        if k == len(string) - 1:
            out += "{}{}".format(time,i)
    k += 1
    j = i

print(out)