문자열압축

def solution(s):
	count=0
	n=len(s)
	answer=""
	
	if s[0]=='1':
		answer+='1'
	for i in range(n-1):
		if s[i]!=s[i+1]:
			answer+=chr(ord('A')+count)
			count=0
		else:
			count+=1
	
	answer+=chr(ord('A')+count)
	return answer

if __name__=="__main__":
	s=input()
	answer=solution(s)
	print(answer)