def sel_sort(spisok):
    for i in range(len(spisok)):
        low = i
        for m in range(i + 1, len(spisok)):
            if spisok[m] < spisok[low]:
                low = m
        spisok[i], spisok[low] = spisok[low], spisok[i]


homemade_list_for_Ruslan = input()
homemade_list_for_Ruslan = list(map(int, homemade_list_for_Ruslan))
sel_sort(homemade_list_for_Ruslan)
finish = homemade_list_for_Ruslan.count(homemade_list_for_Ruslan[0])
print(finish)