G1 generates L(G1) = { w e w^r | w Є (a,b) and w^r = reverse of w }
G2 generates L(G2) = { we | w Є (aa + bb)* }
-----------------------------------------------------------------------------------------------------
now
1st smallest string generated by L(G2) is e which belongs to L(G1)
2nd smallest string should be aae or bbe which belongs to L(G2) and this does not belongs to L(G1).
Answer = length 3 (aae or bbe)