run len encode

text = input()

l_text = len( text )
flag = True
if l_text < 1:
    print( "Invalid input" )
    flag = False
elif l_text == 1 :
    result = [ text, 1 ]
    flag = True
else :
    result = []
    cnt = 0
    i = 0
    j = 0
    y = text[i]
    z = text[i+1:]
    print( y,z )
    cnt += 1
    if z[j] == y :
        cnt += 1
    else :
        result.append(y)
        result.append(cnt)
        if len(z) < 1 :
            break
        elif len( z) == 1 :
            result.append(z)
            result.append(1)
            flag = True
            break
            
        
    
    
    
if flag :
    for idx in result :
        print( f"{idx}",end='')