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use io::{stdin,println,ReaderUtil};
fn main() {
let dna1 = stdin().read_line();
let dna2 = stdin().read_line();
assert str::len(dna1) == str::len(dna2);
let mut hamming = 0;
for str::each_chari(dna1) |i, ch| {
if ch != str::char_at(dna2, i) {
hamming += 1;
}
}
println(fmt!("%d", hamming));
}
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