#include<stdio.h>
#include<string.h>
int check_permutation(char s1[], char s2[])
{
int c[27],i;
for(i=0;i<27;i++)
c[i]=0;
if(strlen(s1)!=strlen(s2))
return 0;
for(i=0;s1[i]!=NULL;i++)
{
c[0]= s1[i];
if(c[0]>96)
c[0]=c[0]-96;
else c[0]=c[0]-64;
c[c[0]]++;
c[0]= s2[i];
if(c[0]>96)
c[0]=c[0]-96;
else c[0]=c[0]-64;
c[c[0]]--;
}
for(i=1;i<27;i++)
{
if(c[i]!=0)
return 0;
}
return 1;
}
int main()
{
char s1[20],s2[20];
scanf("%s%s",&s1,&s2);
if( check_permutation(s1,s2) )
printf("\n Permutation of each other");
else
printf("\n NOT a Permutation ");
return 0;
}