Problem: uppercase the 17th letter

Code: uppercase+the+17th+letter/tails_1684721981

Nibbles version: 0.2 | 0.21 | 0.22 | 0.23 | 0.24 | 0.25 | 1.00

Format: Compact | Simple | +Type | Table | JSON | .nbl (DeBruijn) | .nbl (names)

(implicit map) 
    `\ (special scans) 
        @ (= fstLine) 
        : (foldop: cons) 
    ? (if/else) <--arg( B A ) 
        == (equal?) 
            , (length) 
                | (filter) 
                    `) (swapped uncons) -->let( C ) 
                        \ (reverse) 
                            $ (= B) 
                    $ (= D) <--arg( D ) 
            16 (integer) <--arg( E ) 
        `) (to uppercase) <--arg( F ) 
            @ (= C) 
        (implicit arg = C)