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

#define rd_skip() while(*rp++>=48)
#define rd() ({long _v=0,_c,_neg=*rp=='-'?++rp,1:0;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_neg?-_v:_v;})
#define rep(v,e) for(long v=0;v<e;++v)

short a[44100];

double l[]={261.6,294.3,327.0,348.8,392.4,436.0,490.5};

int main(){
	char*mmap();
	char*rp=mmap(0l,1l<<25,1,2,0,0ll);
	rd_skip();
	rep(i,20000){
		a[i]=rd();
	}
	long b=0;
	char const*z;
	rep(i,7){
		rep(j,170){
			long s=0;
			rep(k,100){
				s+=a[j+(long)(k*(44100/l[i]))];
			}
			if(b<s){
				b=s;
				z="C4D4E4F4G4A4B4"+i*2;
			}
		}
	}
	write(1,z,2);
	_exit(0);
}