function(e,t){if(!e||!t)return 0;let r=e.split(""),n=t.split(""),i=0,a=r.length-1,o=n.length-1,s=0;for(;i<a&&0<o;)r[i]!==n[0]&&(i+=1,s+=1),r[a]!==n[o]&&(a-=1,s+=1);return s}

result

2