快手_字符串归一化

#encoding=utf-8

import sys

chs=sys.stdin.readline().strip("\n")

res=[0]*26

for i in range( len( chs ) ):
    res[ ord( chs[i] )-97 ]+=1

f_res=""

for i in range( len( res ) ):
    if res[i]!=0:
        f_res+=chr( 97+i )+str( res[i] )

print f_res