import numpy as np

def isUniqueChars(str):

    if len(str)>128:
        return False

    char_set = np.zeros((128))

    for id in range(len(str)):

        val = ord(str[id])
        if char_set[val] == 1:
            return False
        char_set[val] = 1

    return True

input_str = "sentence"
print(isUniqueChars(input_str))

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