testcases:
  - name: "testcase 1"
    inputs:
    - 1 : "g"
    output: 
    - 1 : "g"
  - name: "testcase 2"
    inputs:
    - 1: "ggaabcdeb"
    output:
    - 1 : "bcdeb"
  - name: "testcase 3"
    inputs:
    - 1: "abbddaccaaabcd"
    output:
    - 1 : "abcd"
  - name: "testcase 4"
    inputs:
    - 1: "aabbccdd"
    output:
    - 1 : ""
  - name: "testcase 5"
    inputs:
    - 1: "aannkwwwkkkwna"
    output:
    - 1 : "kwkwna"

  - name: "testcase 6"
    inputs:
    - 1: "abbabccblkklu"
    output:
    - 1 : "u"
  - name: "testcase 7"
    inputs:
    - 1: "ttltlltlhiijhkk"
    output:
    - 1 : "hjh"
  - name: "testcase 8"
    inputs:
    - 1: "aaaaaaaaaa"
    output:
    - 1 : ""
  - name: "testcase 9"
    inputs:
    - 1: "bbb"
    output:
    - 1 : "b"
  - name: "testcase 10"
    inputs:
    - 1: "abcba"
    output:
    - 1 : "abcba"
  - name: "testcase 11"
    inputs:
    - 1: "abccba"
    output:
    - 1 : ""