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实现代码

if __name__ == '__main__':    num = int(input())    n = [int(i) for i in str(num)]    s = ''    if len(n) == 3:        for i in range(1, n[0] + 1):            s += 'B'        for i in range(1, n[1] + 1):            s += 'S'        for i in range(1, n[2] + 1):            s += str(i)    if len(n) == 2:        for i in range(1, n[0] + 1):            s += 'S'        for i in range(1, n[1] + 1):            s += str(i)    if len(n) == 1:        for i in range(1, n[0] + 1):            s += str(i)    print(s)

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