In the cryptarithm SEND + MORE = MONEY, each letter represents a unique digit (0-9). Solving the column addition from right to left: D+E=Y (with possible carry), N+R=E (with carry), E+O=N (with carry), S+M=M (which means S=9 with carry). The unique solution is S=9, E=5, N=6, D=7, M=1, O=0, R=8, Y=2, giving SEND=9567, MORE=1085, and MONEY=10652.