Tell us what @all looks like. Is it a one-dimensional array composed of the N lines of a block? Is it a 2-dimensional array where you store each block in thr array?
What is <1> as opposed to <1c>? Something to be displayed, or manipulated, or an index into your array, or...?
You seem to be suffering from I know what I mean. Why don't you?.
REVISED: That last was uncalled for. I just reread your post. Why not simply maintain a "counter" of a single character (null initially, then 'a', 'b', etc. Be careful what happens after 'z'), incrementing the counter each time you hit a record starting <1>? Then you could output it at will...
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