repeated char to upper
# function for changing the
# repeated characters to uppercase
def RepeatedUpper(s):
# declaring dictionary
dic = {}
# Traversing the string
for i in s:
# If the character is already
# present in dictionary then increment
# the frequency of the character
if i in dic:
dic[i] = dic[i]+1
# If the character is not present in
# the dictionary then inserting
# the character in the dictionary
else:
dic[i] = 1
ans = ''
# traversing the string
for i in s:
# if the frequency of the character is
# greater than one
if dic[i] > 1:
# change into uppercase
i = i.upper()
# appending each character to the ans
ans = ans+i
return ans
# Driver code
s = 'geeks for geeks'
# function call
print(RepeatedUpper(s))