[Python] Color only a part of a line in the output

I have the below script which works fine, I only want to make the The running sum is: integer output to be colored.

I have defined the class style which I am trying to use.

Code:

#!/usr/local/bin/python3.6
import os
os.system("")

# Group of Different functions for different styles
class style():
BLACK = '\033[30m'
RED = '\033[31m'
GREEN = '\033[32m'
YELLOW = '\033[33m'
BLUE = '\033[34m'
MAGENTA = '\033[35m'
CYAN = '\033[36m'
WHITE = '\033[37m'
UNDERLINE = '\033[4m'
RESET = '\033[0m'

def running_sum(n):
running_sum = 0
for k in range(n):
running_sum += k
print(f"The running sum is: {running_sum}")

if __name__ == "__main__":
running_sum(int(input("Enter an integer: ")))


Script output:

Enter an integer: 15
The running sum is: 105


In the above script 105 is the output which I want to printed in red color.

I tried to use

print(style.RED + f"The running sum is: {running_sum}")


but this makes the entire output red.

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