```pyfrom flask import Flask, request, render_template, render_template_string, redirectimport subprocessimport urllibflag = open('flag.txt').read()app = Flask(__name__)@app.route('/')def main():    return redirect('/login')
@app.route('/login',methods=['GET','POST'])def login():    if request.method == 'GET':        return render_template('login.html')    elif request.method == 'POST':        if len(request.values["username"]) >= 40:            return render_template_string("Username is too long!")        elif len(request.values["username"].upper()) <= 50:            return render_template_string("Username is too short!")        else:            return flagif __name__ == '__main__':    app.run(host='0.0.0.0', port=8000)```
My [teammate](https://github.com/Fundaystrike) found that `ß` when uppercase is `SS`. So just submit with 25 of them to pass the checks. `ßßßßßßßßßßßßßßßßßßßßßßßßßßß`
Flag: `n00bz{1mp0551bl3_c0nd1t10n5_m0r3_l1k3_p0551bl3_c0nd1t10ns}`