**From New Scientist #1194, 14th February 1980** [link]

In the addition sum below, letters have been substituted for digits. When Uncle Bungle made up this sum he intended that the same letter should stand for the same digit wherever it appeared, and that different letters should stand for different digits. And indeed that is generally the case. But unfortunately there was an exception. Uncle Bungle made a careless mistake and *one* letter was wrong.

Which letter was wrong? Write out the sum with numbers substituted for letters.

[enigma51]

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Using the substituted sum solver from the

enigma.pylibrary, the following Python program runs in 42ms.Solution:The first X in the result is incorrect (it should have been W). The actual sum is: 50874424 + 53826424 + 50921424 = 155622272.