a = input()
a = a + " "
s= 1
for i in range (0,len(a)-1):
    if a[i]==a[i+1]:
        s += 1
    else:
        if s != 1:
            print(s,end='')
        print(a[i],end='')
        s = 1
/**************************************************************
	Problem: 1103
	User: admin
	Language: Python
	Result: Accepted
	Time:99 ms
	Memory:34480 kb
****************************************************************/