def capitalize(s, ind):
    split_s = list(s)
    for i in ind:
        try:
            split_s[i] = split_s[i].upper()
        except IndexError:
            print('Index out of range : ', i)
    return "".join(split_s)
print(capitalize("abracadabra", [2, 6, 9, 10, 50]))

Index out of range :  50
abRacaDabRA

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