#!/usr/bin/env python

import sys
import matplotlib.pyplot as plt


def parse_input(lines):
    x_vals = []
    y_vals = []
    for line in lines:
        line = line.strip()
        if not line:
            continue
        parts = line.replace(',', ' ').split()
        if len(parts) == 1:
            y_vals.append(float(parts[0]))
            x_vals.append(len(x_vals))
        elif len(parts) >= 2:
            x_vals.append(float(parts[0]))
            y_vals.append(float(parts[1]))
        else:
            continue

    return x_vals, y_vals


def parse_file(file):
    with open(file, "r") as f:
        lines = f.readlines()
    return parse_input(lines)


def parse_stdin():
    lines = sys.stdin.readlines()
    return parse_input(lines)


def plot(x_vals, y_vals):
    plt.plot(x_vals, y_vals)
    plt.grid(True)
    plt.show()


if __name__ == "__main__":
    if len(sys.argv) == 2:
        x_vals, y_vals = parse_file(sys.argv[1])
    else:
        x_vals, y_vals = parse_stdin()

    plot(x_vals, y_vals)