简单但是欣怡的一个题：
image-20231017140308256

看r数组：

image-20231017140338837

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enc = [53,47,47,50,40,20,39,59,61,112,60,10,61,115,58,10,31,115,61,102,33,28,109,40]
key = ['S','C','N','U']
flag = ""
for i in range(len(enc)):
    temp = enc[i] ^ ord(key[i%4])
    flag += chr(temp)
print(flag)