x=input()
X=""
for char in 'a','b','c':
    curCharCount=1
    while True:
      curPos=x.find(char)
      while x[1+curPos]==char:
        curCharCount+=1
      X=X+char+str(curCharCount)
      x=x[curPos+curCharCount:]
      if x=="":
        break
print(X)