#Frequency analysis: print the list of pairs (character, number of occurrences) found in a given string

def fa(string):
    alp="abcdefghijklmnopqrstuvwxyz"
    for i in range(0, len(alp)):
        if string.count(alp[i]) >0:
            print('('+ alp[i]+','+ string.count(alp[i])+') ')