# include <stdio.h>
main(){
FILE *be = fopen("be.txt", "r");
FILE *ki = fopen("ki.txt", "w");
int x, y, i, j;int a, b;
fscanf(be, "%d %d", &x, &y);
printf("%d %d\n",x ,y);
char kod[y];char forras[250];
char tomb[250];for(i=0;i<=y;i++){
fscanf(be, "%c", &kod[i]);}
for(i=0;i<250;i++){tomb[i]=kod[(i%y)+1];}
for(i=-1;i<250;i++){fscanf(be, "%c", &forras[i]);}
if(x==1){for(i=0;forras[i]!='\n';i++){
a=forras[i]-'a';b=tomb[i]-'A';
a+=b;a=a%26;forras[i]='a'+a;
fprintf(ki,"%c", forras[i]);}} else {
for(i=0;forras[i]!='\n';i++){
a=forras[i]-'a';b=tomb[i]-'A';
if(a<b){a+=26;}a-=b;a%=26;
forras[i]='a'+a;fprintf(ki,"%c", forras[i]);}}
fprintf(ki,"\n");fclose(be);fclose(ki);
return 0;}