f = str(input())
i = 0
j = len(f)-1
x = 0
while i<=j:
    for x in range(x,j):
        p = 1
        a = f[x]
        x+=1
        b = f[x]
        while a==b:
            a=b
            x+=1
            b=f[x]
            p+=1
        print(a+str(p), end='')