# Write a Python program to Find all duplicate characters in string 
 from collections import Counter
  
def find_dup_char(input):
  
    # now create dictionary using counter method
    # which will have strings as key and their 
    # frequencies as value
    WC = Counter(input)
    j = -1
      
      
    # Finding no. of  occurrence of a character
    # and get the index of it.
    for i in WC.values():
        j = j + 1
        if( i > 1 ):
            print WC.keys()[j],
  
# Driver program
if __name__ == "__main__":
    input = 'geeksforgeeks'
    find_dup_char(input)