grow letter rectangles by tails

s=(\\n {a..z})
a+=+1
d=1
c+=($a) ${b/>}||d+=($a)
read -n1 b&&. *||for((;x=c[i=x?i+1:0],y=d[j+=!x];)){
printf ${s[x&&x<y?y:x]}
}

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