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def count_substring(string, sub_string):

index=0

count=0

while(1):

found=string.find(sub_string,index)

#print(found)

if(found!=-1):

count = count+1

index=found+1

else:

break

return count

if __name__ == '__main__':

string = "ABCDCDC"

sub_string = "CDC"

count = count_substring(string, sub_string)

print(count)