123

#include <stdio.h>
#include <math.h>
#include <string.h>
int main (void)
{
    int n,i,fi,inf;
    char str[50];
    printf("Write the fi:");
	scanf("%i",fi);
	printf("%i\n",fi*3);
	printf("Write the str:");
    scanf("%s",str);
    n = strlen(str);
    int k = 0;
	for (n; k < n; k++)
    {
        printf("%c\n",str[k]);
    }
   }