import pandas as pd

# Update input csv files
files = ["input-1.csv", "input-2.csv"]


n = 0
for file in files:
    contents = [(f"u{n+1}", f"user{n+1}"), (f"u{n+2}", f"user{n+2}")]
    output = pd.DataFrame(contents, columns=["userid", "name"])
    print(output)
    output.to_csv(file, header=True, index=False)

    n = n + 2