<critic level="harsh">

• Your code does not produce the output desired by the OP.
• You should use warnings; because it will generate warning messages which point to bugs in the code, particularly the odd usage of sprintf.
• You should always check the success of open.
• There is no indentation, which makes it difficult to understand the code.
• use strict; to avoid other common programming mistakes.
• It is a good practice to use the 3-argument form of open and to use lexical filehandles:

open my $fh, '<', 'txt1.txt' or die "Can not open txt1.txt: $!";
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