###スペース区切りの2つの整数と、文字列が入力されるので、2つの整数の範囲の部分文字列を出力してください。
a,b = input().split()
a = int(a)-1
b = int(b)
st = input()
print(st[a:b])
入力例2
2 6
Welcome to the paiza! I`m studying ruby!
出力例2
elcom
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