#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

#define rd_init() char*rp=({char*mmap();mmap(0l,1l<<25,1,2,0,0ll);})
#define rd() ({int _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;})
#define repeat(e) for(typeof(e)_=e;_--;)
#define max(a,b) (a>=b?a:b)
#define chmin(v,a) (v=v<=a?v:a)

int main(){
	rd_init();
	int n=rd();
	int s=rd();
	int t=rd();
	int k=rd();
	int as=0;
	int at=0;
	int m=1<<30;
	repeat(n){
		int a=rd();
		if(!--s) as=a;
		if(!--t) at=a;
		chmin(m,a);
	}
	if(as+at<=k){
		write(1,"1",1);
	}else if(m+max(as,at)<=k){
		write(1,"2",1);
	}else{
		write(1,"-1",2);
	}
	_exit(0);
}