data = input() + "."
l = len(data)
i = 0
c = 1
while (i < (l - 1)):
    if ((i == 0) and (data[i]) != (data [i+1])):
        s = data[i]
        c = 1
        i += 1
        print(s,c,end='',sep='')
    elif ((i != (l - 2)) and (data[i-1] != data[i]) and (data[i] != data[i+1])):
        s = data[i]
        c = 1
        i += 1
        print(s,c,end='',sep='')
    elif ((i != (l - 1)) and (data[i] == data[i+1])):
        while (data[i] == data[i+1]):
            s = data[i]
            i += 1
            c += 1
        print(s,c,end='',sep='')
        c = 1
        i += 1
    elif ((i == (l - 1)) and (data[i] != data[i-1])):
        s = data[i]
        c = 1
        print(s,c,end='',sep='')