flowchart TD
    A([Start Program]) --> B[Set the_letter to z]
    B --> C[Set the_word to pizza]
    C --> D{Is the_letter found inside the_word?}
    D -- Yes --> E[Print: the_word contains the letter]
    D -- No --> F[Print: the_word does NOT contain the letter]
    E --> G([End])
    F --> G

flowchart TD
    A([Start]) --> B[Set marbles = 10]
    B --> C{Is marbles greater than 0?}
    C -- No --> H([Print: You are all out of marbles - End])
    C -- Yes --> D[Print: number of marbles remaining]
    D --> E[Print asterisks equal to marble count]
    E --> F{Is marble count 3 or fewer?}
    F -- Yes --> G[Print WARNING message]
    F -- No --> I[Subtract 1 from marbles]
    G --> I
    I --> C

flowchart LR
    A([SSH into z/OS]) --> B[Open VSCode]
    B --> C[Edit Python file]
    C --> D[Save changes]
    D --> E[Run in USS terminal]
    E --> F{Output correct?}
    F -- No --> C
    F -- Yes --> G[Submit CHKCODE JCL job]
    G --> H([Challenge Complete])

flowchart LR
    S1[Steps 1-2\nRun and Read code1.py] --> S2[Step 3\nVSCode Configuration]
    S2 --> S3[Steps 4-5\nVariables in code2.py]
    S3 --> S4[Steps 6-7\nif and else Logic]
    S4 --> S5[Step 8\nwhile Loops in marbles.py]
    S5 --> S6[Step 9\nDebugging Broken Logic]
    S6 --> S7[Step 10\nAsterisks Visual Output]
    S7 --> S8[Step 11\nFinal Message]
    S8 --> S9[Step 12\nSubmit and Validate]

sequenceDiagram
    participant Dev as Developer
    participant SSH as SSH Encrypted Tunnel
    participant zOS as IBM z/OS Mainframe
    participant RACF as RACF Auth System
    participant PY as Python 3 Runtime

    Dev->>SSH: Connect with mainframe credentials
    SSH->>zOS: Encrypted handshake
    zOS->>RACF: Validate user identity
    RACF-->>zOS: Access granted
    zOS-->>Dev: USS Shell session opened
    Dev->>PY: python3 marbles.py
    PY->>zOS: Read userid and system clock
    PY-->>Dev: Program output displayed
    Dev->>zOS: Submit CHKCODE JCL job
    zOS-->>Dev: Validation result returned

graph TD
    A[Developer Workstation] --> B[Visual Studio Code]
    B --> C[SSH Remote Extension]
    C --> D[IBM z/OS Mainframe]
    D --> E[USS - Unix System Services]
    E --> F[Python 3 Interpreter]
    F --> G[code1.py]
    F --> H[code2.py]
    F --> I[marbles.py]
    D --> J[JCL - Job Control Language]
    J --> K[CHKCODE Validation Job]
    K --> L[Pass or Fail Result]

graph TD
    V[Variables] --> IF[if Statements]
    IF --> ELSE[else Clauses]
    ELSE --> W[while Loops]
    W --> S[String Slicing]
    S --> D[Debugging Logic]
    D --> F[Full Working Program]
    V --> W
    F --> J[JCL Validation and Submission]

graph TD
    A[IBM Z Xplore CODE1 Completed] --> B[Python Fundamentals on z/OS]
    B --> C[Understands Enterprise Infrastructure]
    C --> D[Bridge Between Modern Cloud and Legacy Mainframe]
    D --> E[Valuable in Banking, Insurance, Government, Healthcare]
    E --> F[Rare Skill - Most Developers Do Not Have This]
    F --> G[That Developer Is Me]