def reverse_string(s):
    # 确保输入字符串仅包含小写字母
    assert all(c.islower() for c in s), "输入字符串必须只包含小写字母"
    # 使用切片操作翻转字符串
    reversed_s = s[::-1]
    return reversed_s

# 示例
input_string = str(input())
output_string = reverse_string(input_string)
print(output_string)