Alphabet Triangle Pattern

The program must accept an alphabet CH as the input. The program must print the desired pattern as shown in the Example Input/Output section.

Input Format:
The first line contains the alphabet CH.

Output Format:
The lines containing the desired pattern as shown in the Example Input/Output
section.

Example Input/Output 1:

Input:
F

Output:
A
BB
CCC
DDDD
EEEEE
FFFFFF

Example Input/Output 2:

Input
g

Output
A
BB
CCC
DDDD
EEEEE
FFFFFF
GGGGGGG

#include<stdio.h>
#include<stdlib.h>
int main()
{
char a;
scanf("%c",&a);

//converting the user input to uppercase
a=toupper(a);

for (char i='A';i<=a;i++)
{
for (char j='A';j<=i;j++)
printf("%c",1);
printf("n")
}
}