30 lines
832 B
C++
30 lines
832 B
C++
#include<stdio.h>
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#include<string.h>
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char c[28]={'_','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','.'};
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int plaincode[71];
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int main(){
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int k,i,n;
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char ch[71];
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while(scanf("%d",&k),k){
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scanf("%s",ch);
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n=strlen(ch);
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for(i=0;i<n;i++){
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if(ch[i]>='a'&&ch[i]<='z'){
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plaincode[(k*i)%n]=((ch[i]-96)+i)%28;
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//printf("%d ",(int)(ch[i]-96));
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}
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else if(ch[i]=='_'){
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plaincode[(k*i)%n]=((ch[i]-95)+i)%28;
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}
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else{
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plaincode[(k*i)%n]=((ch[i]-19)+i)%28;
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}
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}
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for(i=0;i<n;i++){
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printf("%c",c[plaincode[i]]);
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}
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printf("\n");
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}
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return 0;
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}
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