s = input()
n = len(s)
t = 1
ans = 0
for i in range(n-1):
    if s[i]==s[i+1]:
        t+=1
    else:
        print(s[i],end = "")
        print(t,end = "")
        t=1
print(s[i+1],end = "")
print(t,end = "")