1111111111111111111111111111111111111111111111111111111111111111111+99999999999999999999999999999999999+22222222222222222222222222222222+77777777x0x999999999999999x1111111+444444444444444444444444444x99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
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có 1111111111111111111111111111111111111111111111111111111111111111111 số 1
có 99999999999999999999999999999999999 số 9