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+#!/usr/bin/env python3
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+import sys
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+
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+def read_dots(f):
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+ for line in f:
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+ if line == '\n':
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+ break
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+ x, y = line.split(',')
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+ yield int(x), int(y)
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+
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+def read_folds(f):
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+ for line in f:
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+ axis, at = line.split()[-1].split('=')
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+ yield axis == 'y', int(at)
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+
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+def flip(i, at):
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+ return i if i < at else i - 2 * (i - at)
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+
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+def fold(dots, up, at):
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+ return {(x, flip(y, at)) if up else (flip(x, at), y) for x, y in dots}
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+
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+def plot(dots):
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+ xmin = min(x for x, y in dots)
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+ xmax = max(x for x, y in dots)
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+ ymin = min(y for x, y in dots)
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+ ymax = max(y for x, y in dots)
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+ for y in range(ymin, ymax + 1):
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+ print(''.join(' #'[(x, y) in dots] for x in range(xmin, xmax + 1)))
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+
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+dots = list(read_dots(sys.stdin))
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+first_fold, *other_folds = read_folds(sys.stdin)
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+dots = fold(dots, *first_fold)
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+print(len(dots))
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+
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+for up, at in other_folds:
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+ dots = fold(dots, up, at)
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+plot(dots)
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Taddeus Kroes