testcases:
  - name: "testcase 1"
    inputs:
    - 1 : abb
    output: 
    - 1 : bab
  - name: "testcase 2"
    inputs:
    - 1: aaaaabbbbbbb
    output:
    - 1 : ""
  - name: "testcase 3"
    inputs:
    - 1: jjjjj
    output:
    - 1: ""
  - name: "testcase 4"
    inputs:
    - 1: aaabc
    output:
    - 1: abaca
  - name: "testcase 5"
    inputs:
    - 1: fofjjb
    output:
    - 1: fofjbj
  - name: "testcase 6"
    inputs:
    - 1: programming
    output:
    - 1: programimng
  - name: "testcase 7"
    inputs:
    - 1: hello
    output:
    - 1: helol