Henry Ernest Dudeney/Puzzles and Curious Problems/99 - The Conspirators' Code

by : $99$

 * The Conspirators' Code
 * Two conspirators had a secret code.
 * Their letters sometimes contained little arithmetical sums related to some quite plausible discussion,
 * and having an entirely innocent appearance.
 * But in their code each of the ten digits represented a different letter of the alphabet.
 * Thus, on one occasion, there was a little sum in simple addition which, when the letters were substituted for the figures, read as follows:

F L Y   F O R + Y O U R --- L I F E
 * It will be found an interesting puzzle to reconstruct the addition sum with the help of the clue that $I$ and $O$ stand for the figures $1$ and $0$ respectively.