If MUNREB is written as 628146 and IESRES as 345145, how will SERBER be written?

This is a direct letter-to-digit coding system. Let's map the letters to their numbers from the given examples:From MUNREB $\to$ 628146:M = 6U = 2N = 8R = 1E = 4B = 6From IESRES $\to$ 345145:I = 3E = 4S = 5R = 1E = 4S = 5Now, substitute the values for SERBER:S = 5E = 4R = 1B = 6E = 4R = 1Thus, SERBER is coded as 541641.