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#!/usr/bin/env perl
use strict;
use warnings;
use 5.016;
my %mass = qw(
A 71.03711
C 103.00919
D 115.02694
E 129.04259
F 147.06841
G 57.02146
H 137.05891
I 113.08406
K 128.09496
L 113.08406
M 131.04049
N 114.04293
P 97.05276
Q 128.05858
R 156.10111
S 87.03203
T 101.04768
V 99.06841
W 186.07931
Y 163.06333
);
my %protein = map {
val($mass{$_}) - 1 => $_,
val($mass{$_}) => $_,
val($mass{$_}) + 1 => $_,
} keys %mass;
chomp(my $prev = <>);
while (<>) {
chomp;
my $diff = val($_) - val($prev);
print $protein{$diff};
$prev = $_;
}
sub val { int($_[0] * 10000 + 0.5) }
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