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#include <stdio.h>
#include <string.h>
#define N 80
f(char *s,int a,int b)
{
int i;
char c[N],*p;
p=c;

for(i=0;i <10;i++)
*(p+i)=*(s+a-b+i);

for(i=0;i <a-b;i++)
*(p+b+i)=*(s+i);

*(p+a)='\0';
   
puts(c);


}

void main()
{
int a,b;
char s[N];
scanf("%d\n",&b);

gets(s);
a=strlen(s);
f(s,a,b);

}

---

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for(i=0;i <10;i++)

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---

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char* str = "abcdefg";
int b = 3;
char format[100];
sprintf(format, "%%s%%.%ds", b + 1);//%s%.(b+1)s
printf(format, str + b, str);