import math

def main():
    a = input("Prv string: ")
    # b = input("Vtor string: ")

    a_mapa = dict()
    b_mapa = dict()

    for c in a:
        if c not in a_mapa.keys():
            a_mapa.update({c: 1})
        else:
            a_mapa.update({c: a_mapa.get(c) + 1})



    for key, value in a_mapa.items():
        print(f"Key: {key} = {value}")




if __name__ == "__main__":
    main()