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#include <stdio.h>
int main()
{
FILE *f = fopen("INP.TXT", "r");
unsigned long long n;
long long a, b, c;
char s[5] = {89, 69, 83, 10};
fscanf(f, "%lld", &n);
if (n > 2) {
fscanf(f, "%lld %lld", &a, &b);
c = b - a;
for (n -= 2; n; n--) {
a = b;
fscanf(f, "%lld", &b);
if (a - b + c) {
s[0] = 78;
s[1] = 79;
s[2] = 10;
s[3] = 0;
break;
}
}
}
fclose(f);
f = fopen("OUT.TXT", "w");
fputs(s, f);
fclose(f);
return 0;
}
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