If you are going to use a for loop, I'd use something along the lines of ...
my $keys = "5 10 14 16 17 20 25 26 38 1 42
+ 47 54";
my $substr = '1';
print "\nExist" if $_ eq $substr for split /\s+/, $keys;
Having said that, the OP has the whiff of homework
A user level that continues to overstate my experience :-))
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