a,b= input(),[]
for i in a:
    if len(b) == 0:
        b.append(1)
        b.append(i)
    elif b[-1] != i:
        b.append(1)
        b.append(i)
    else:
        b[-2] = b[-2] + 1
print("".join(map(str, b)))

11行解决战斗