ACM-ICPC-2018-Online-ROBOGAME.py

def main():
    no = int(input())

    for q in range(no):

        seq = input()

        nw = [0] * len(seq)

        for index in range(len(seq)):
            chr = seq[index]
            if chr.isdigit():
                num = int(chr)
                for i in range(max(0, index - num), min(len(seq), index + num + 1)):
                    nw[i] += 1

            else:
                continue

        if max(nw) > 1:
            print('unsafe')

        else:
            print('safe')


if __name__ == '__main__':
    main()