import requests

url = "https://api.13-215-85-171.sslip.io/v1/sandboxes/{id}/processes/{pid}/stdin"

payload = { "data": "<string>" }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)