def sum_even_chars(s):
return sum(ord(ch) if ord(ch) % 2 == 0 else 0 for ch in s)
print(sum_even_chars(''))
print(sum_even_chars('a'))
print(sum_even_chars('b'))
print(sum_even_chars('ab'))
print(sum_even_chars('aba'))
print(sum_even_chars('abb'))
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