| code #1 |
| 1 | n=int(input()) f=input() if len(set(f))==1: print("NO") else: ams="" for i in range(n): if f[i]!=f[i+1]: ams+=f[i]+f[i+1] break print("YES") print(ams) n = int(input()) s = input() flag = 0 for i in range(len(s)): if i > 0 and s[i] != s[i -1]: flag = i if flag == 0: print('NO') else: print('YES') print(s[flag - 1:flag + 1]) |
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