Abcdg multiplied by a equals ggggg I can't do it

Abcdg multiplied by a equals ggggg I can't do it

If 5-digit times 1-digit = 5-digit, the high bit is a * a, and if no carry, the maximum value of a is 3
1) If a = 1, then 1bcdg * 1 = 1bcdg
2) If a = 2,2g is g, then 2G = g, g = 0, discard, or 2G = 10 + G, g = 10, discard
3) If a = 3, a * a = 9, can not carry, then G = 9, and 3 * 9 = 27, bit 7 is not 9, abandon
Therefore, there is no solution to the problem