d[110],g[110],ans[6000];c,i,j,n,k,t,a,b;
main(){
	scanf("%d%d",&n,&k);
	for(i=1;i<=n;i++)d[i]=i;
	while(k--){
		scanf("%d%d",&a,&b);
		d[a]^=d[b]^=d[a]^=d[b];
	}
	for(i=1;i<=n;i++)scanf("%d",g+i);
	for(i=1;i<=n;i++)for(j=1;j<=n-i;j++)if(g[d[j]]>g[d[j+1]]){
		ans[c++]=j;
		d[j]^=d[j+1]^=d[j]^=d[j+1];
	}
	printf("%d\n",c);
	for(i=0;i<c;i++)printf("%d %d\n",ans[i],ans[i]+1);
}