assistant
[STOP - TASK BLOCKED]
- Current task (TASK (bug_fix): span_letters opens out a written span such as a dash between two letters into every letter from the first to the last, the last one included. Anything not written as exactly two letters with a dash between them, or running backward, is given back untouched. Fix span_letters. Return the complete fixed file.)
- Current target (solution.py)
- Current content of target (solution.py)
- Current interface to preserve (solution.py - def span_letters(span: str) -> str)
- Current stop word (TASK BLOCKED IF ...)
- Current stop word detail (whether a span written across the two cases should be opened out is not stated)

No guess made past these boundaries. Resuming specification for (TASK (bug_fix): span_letters opens out a written span such as a dash between two letters into every letter from the first to the last, the last one included. Anything not written as exactly two letters with a dash between them, or running backward, is given back untouched. Fix span_letters. Return the complete fixed file. TARGET: solution.py CURRENT CONTENT OF solution.py (this is the file to change): ```def span_letters(span: str) -> str:    if len(span) != 3 or span[1] != "-":         return span    start = ord(span[0])    end = ord(span[2])    if start > end:         return span    out = ""    for code in range(start, end):         out += chr(code)    return out``` INTERFACE (the result must expose exactly this): def span_letters(span: str) -> str STOP AND REPORT BLOCKED IF (do not guess past any of these): - Whether a span written across the two cases should be opened out is not stated. OUTPUT: Reply with the complete new content of solution.py, as one fenced code block and nothing else. Not a diff, not an excerpt, not the changed lines — the whole file as it should exist after your change.)