encode decode(lab)

#include<stdio.h>
#include<string.h>
int main()
{
    int n,i;
    scanf("%d",&n);
    char str[100];
    scanf("%s",str);
    for(i=0;i<strlen(str);i++)
    {
        str[i]=str[i]+n;
        if(str[i]>'z')
            str[i]=str[i]-26;
    }
    printf("Encoded word is %s\n",str);
    for(i=0;i<strlen(str);i++)
    {
        str[i]=str[i]-n;
        if(str[i]<'a')
            str[i]=str[i]+26;
    }
    printf("Decoded word is %s",str);
}