题解 | #简单密码#

strx = ""
litter = "abcdefghijklmnopqrstuvwxyza"
litterMap = {"2":["a","b","c"], "3":["d","e","f"], "4":["g","h","i"], 
            "5":["j","k","l"], "6":["m","n","o"], "7":["p","q","r","s"],
            "8":["t","u","v"], "9":["w","x","y","z"]}
for s in input():
    if s.isupper():
        strx += litter[litter.find(s.lower()) + 1]
    elif s.islower():
        for i in litterMap:
            if s in litterMap[i]:
                strx += i
                break
    else:
        strx += s
print(strx)