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#define _CRT_SECURE_NO_WARNINGS#include
   
    #include
    
     #define MAXN 300char a[MAXN], b[MAXN];int c[MAXN], d[MAXN], sum[MAXN];int main(){    int i, j, len1, len2, len;    while (~scanf("%s%s", a, b))    {        memset(c, 0, sizeof(c));        memset(d, 0, sizeof(d));        len1 = strlen(a);        for (j = 0, i = len1 - 1; i >= 0; i--)            c[j++] = a[i] - 'a';        len2 = strlen(b);        for (j = 0, i = len2 - 1; i >= 0; i--)            d[j++] = b[i] - 'a';        len = (len1
     
      = 26)            {                sum[i] -= 26;                sum[i + 1] += 1;            }            if (sum[len - 1] >= 26)                len += 1;        }        for (i = len - 1; i >= 0 && sum[i] == 0; i--);        if (i >= 0)        {            for (; i >= 0; i--)                printf("%c", sum[i] + 'a');        }        else            printf("a");        printf("\n");    }    return 0;}
     
    
   

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