Using awk:

awk '{ for (asc=97; asc<=122; asc++)printf ("%c%s\n", asc, $0) }' infile

print character converted of letters start from ascii-code: 97 (character a) upto ascii-code:122 (character z) followed by the current line itself.

Using awk:

awk '{ for (asc=97; asc<=122; asc++)printf ("%c%s\n", asc, $0) }' infile

we used printf and its %c (character conversion modifier, see man awk for more details) to print the character converted of ASCII lower-case English letters start from ascii-code: 97 (character a) upto ascii-code:122 (character z) followed by the current line itself. see ASCII table.